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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) Community | Dec. 31, 2015 USD ($) | Oct. 08, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jan. 24, 2014 USD ($)
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Goodwill | $ 54,042,000 | $ 54,042,000 |  | $ 44,962,000 |
Number of additional banking communities | Community | 2 |  |  |  |
Bank of Commerce [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Total assets acquired |  |  | $ 196,000,000 |  |
Loans |  |  | 147,000,000 |  |
Deposits |  |  | 175,000,000 |  |
Equity capital |  |  | $ 22,000,000 |  |
Percentage of voting interests acquired |  |  | 100.00% |  |
Intangibles assets, net |  |  | $ 7,100,000 |  |
Goodwill |  |  | $ 9,400,000 |  |
The Bank of Union [Member] | BancFirst [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Loans |  |  |  |  | $ 121,000,000
Deposits |  |  |  |  | 302,000,000
Equity capital |  |  |  |  | 4,800,000
Intangibles assets, net |  |  |  |  | 2,200,000
Goodwill |  |  |  |  | 417,000
Other real estate |  |  |  |  | $ 10,000

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